Two-dimensional web property variation modeling and control

Details Two-dimensional web property variation modeling and control Two-dimensional web property variation modeling and control

D - Textiles, Paper

21

F

D21F 7/06 (2006.01) G01B 21/30 (2006.01) G01N 21/89 (2006.01) G01N 33/34 (2006.01) G05D 5/00 (2006.01)

Patent

CA 2234135

A new two-dimensional (2D) variation modeling and control technique for a machine producing a web of material, such as paper, uses functional transformation with basis functions which are wavelets, preferably wavelets derived from and closely resembling the responses generated by actuation of cross direction (CD) actuators of the machine. By using the disclosed functional transformation together with carefully selected basis functions, memory and real-time processing requirements are substantially reduced so that practical controls can be readily implemented. In addition, the functional transformation technique of the present application expands conventional CD correction to also correct for a portion of the residual variations which, until now, have remained uncorrected. The new 2D profile is treated as the superposition of two main components: a pure machine direction (MD) variation component and a two-dimensional sheet variation component.

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